Recycling method for rare earth leaching and leaching water of sulfuric acid roasted rare earth ore concentrate

Abstract

The invention relates to a recycling method for rare earth leaching and leaching water of sulfuric acid roasted rare earth ore concentrate. The recycling method for rare earth leaching and leaching water of the sulfuric acid roasted rare earth ore concentrate is characterized by comprising the following steps of (1) mixing roasted ore and a calcium chloride solution obtained from the sulfuric acid roasted rare earth ore concentrate with a solid-to-liquid ratio of 1 to 1 to 7, performing agitation leaching under normal temperature for 0.5 to 3 hours, neutralizing through calcium compound to enable a PH (Potential Of Hydrogen) value to be from 2 to 3 and filtering to obtain leaching liquid; (2) saponifying an extraction agent P507 through calcium compound and obtaining a saponified P507 extraction agent; (3) mixing the leaching liquid obtained from the step (1) and the saponified P507 extraction agent obtained from the step (2) to extract rare earth, performing reextraction on a loaded organic phase to obtain a high-concentration rare earth chloride solution and meanwhile obtain extraction remained liquid containing calcium chloride; (4) enabling the extraction remained liquid obtained from the step (3) to be used for leaching rare earth. The recycling method for rare earth leaching and leaching water of the sulfuric acid roasted rare earth ore concentrate has the advantages of reducing water consumption by 60%; achieving recycling of extraction remained liquid and being free of wastewater discharging due to the fact that the extraction remained liquid directly returns back to be used for leaching rare earth.

Description

technical field [0001] The invention relates to a rare earth leaching method of sulfuric acid roasting rare earth concentrate and a recycling method of leaching water, which belongs to the field of hydrometallurgy. Background technique [0002] Baotou is endowed with unique rare earth resources, accounting for 81% of the country's rare earth reserves, and Baotou rare earth concentrates account for more than 60% of my country's smelted rare earth concentrates. The process of extracting mixed rare earths from Baotou rare earth concentrate is mainly concentrated sulfuric acid roasting and decomposition method. In this process, after sulfuric acid roasting and decomposition of rare earth concentrate, the rare earth sulfate produced by the reaction is leached with water, and then neutralized with magnesium oxide to obtain a rare earth sulfate solution. Rare earth chloride is prepared through the "transformation" process for subsequent extraction and separation. The currently use...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of sulfuric acid roasting rare earth in order to solve the leaching of sulfuric acid rare earth and the recycling problem of transformation wastewater after the rare earth concentrate is decomposed by sulfuric acid roasting The rare earth leaching of concentrate and the recycling method of leaching water, the present invention can obtain the rare earth chloride solution with a concentration of about 300g / L through the method of calcium chloride solution leaching, and the water consumption for leaching is greatly reduced, which is only half of the original water consumption. 1 / 5~1 / 3; Calcium chloride-containing wastewater formed after extraction and concentration of rare earth chloride by calcium saponification P507 is reused in the leaching process to realize recycling without wastewater discharge

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